Water tube connection



Dec. '15, 1931. G. w. HULSHIZER 1,836,715

WATER TUBE CONNECTION Filed Aug.'l9, 1929 IN V EN TOR. afeor 14022111111 or H15 A TTORNEY Patented Dec. 15, 1931 UNITED STATES PATENT OFFICE GEORGE W I-IU LSHIZER, 0F STEWARTSVILLE, NEW JERSEY, ASSIGNOR TO INGERSOLL- RAND COMPANY, OF JERS EY CITY, NEW JERSEY, 'A CORPORATION OF NEW JERSEY WATER XTUBE oonnnorron Application filed. August 19, 1929. SerialNo. 387,060.

This invention relates to rock drills, but more p rticularly to a water tube connection adapted for use in connection with rock drills employing hollow drill steels for flushing the s; cuttings from the drill hole.

One object of the invention is to protect the water tube against the effects o'fthe force applied to the sealing plug for threading it into the back head. a

10 Another object is to-insure a constantly uniform pressure on the packing member employed for preventing leakage of water along the tube into the percussive element of the drill.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings illustrating the invention and in which similar reference characters refer to similar parts, I

Figure 1 is an elevation, partly in section, of a rock drill equipped with a water. tube connection constructed in accordance with the practice of the invention, and

Figure 2 is an enlarged sectional elevation of the connection.

Referring more particularly to the drawings and at first to Figure LA designates generally a rock drill comprising a cylinder B carrying at its front end a front head C and at its rearward end a back head D.

The parts so far described form the casing of the rock drill and may beheld in the operative positions with respect to each other by means of side bolts E, only a portion of one of which is shown but which may be disposed on opposite sides of the drill in the usual manner.

The front head 0' serves as a housing for a chuck F adapted to receive a chuck bushing G which acts as a guide for a working implement H, only'the rearward or shank portion of which is shown extending into a cavity J in the chuck and having a bore K therethrough for conveying cleansing fluid 45 to the hole being drilled.

The means provided for supplying cleansing fluid to the bore K preferably consists of a tube L having a reduced portion 0 at its forward end which may extend into the rearward end of the bore K. The tube L extends through the cylinder B and throughthe back head D and with its rearward end into a recess P in the back head.

The rearward portion of the recess P is in this instance provided with threads Q i" TGCGSS.

Means are provided for preventing leakage of water from the recess into the cylinder B. .To this end a packing member T is disposed about the tube L and in the bOttom of the recess. On the packing member T is disposed a plate U which acts as aseat for the forward end of a collar l/V on the tube L. On the rearward end of the collar V is seated a bushing X having a bore Y for slidable engagement with the rearward end of the tube L and carrying at its forwardend "a hollow extension Z which encircles the packing member T and the plate U to act as a retainer therefor.

The bushing X may be conveniently guided by permitting its rearward end to extend slidably into a cavity 6 in the plug R and, on the rearward end of the bushing X is a pressure area 0. The water supplied to 5;; the tube L may enter the cavity 5 through a port or ports at in the plug and said ports may be in constant communication with the supply passage 6 1n the back head through channels 7 in the periphery of the plug R.

The water may be supplied to the supply passage e and thus also to the recess P in any suitable manner as for instance by a connection 9 threaded into the back head D to communicate with the sunpi r passa e 6. f

. .i a L b In order to insure an'adequate pressure for compressing the packing T about the tube L a spring h is disposed in the cavity Z) to bear against the pressure area 6 with one end and with its other end against the roof of the cavity '6.

To'the end that the parts which act against the tube for compressing the packing T may be protected against the pressure applied for tightening the plug R, the packing T and the plate U are preferably of such height and the bushing X is preferably so formed that when the plug R is tightly threaded into the recess P and the spring h is acting against the bushing, the bushing X will be held free from contact with any end surface, as for instance, the end surface [J of the plug R. In this way the pressure applied for threading the plug R tightly into the recess will not be transmitted to the bushing X and, in consequence, the packing member T will not be unduly compressed. Neither will the tube L be exposed to a crushing pressure as has been frequently found to be the case in devices of this type where, in efforts to assure adequate compression of the packing, a tremendous pressure was applied to the plug and this pressure, when transmitted to the water tube L, had the effect of either crushing the water tube or distorting it as well as the packing to such an extent that instead of preventing leakage a free path for Water was actually provided between the recess and the cylinder.

I claim:

1. In a rock drill, the combination of a cylinder and a back head therefor having a recess, a water tube extending through the cylinder and into the recess, a collar on the tube, a packing member encircling the tube to prevent the leakage of water from the recess into the cylinder, a plate seated on the packing member to form a seat for one end of the collar, means bearing against the other end of the collar, a plug forming a closure for the recess to prevent the leakage of water therefrom exterior of the back head, and a spring acting against the plug and the said means for compressing the packing.

2. In a rock drill, the combination of a cylinder and a back head therefor having a recess, a water tube extending through the cylinder and into the recess, a collar on the tube, a packing member disposed in the bottom of the recess and encircling the tube to prevent leakage of water from the recess into the cylinder, a plate on the packing forming a seat for one end of the collar, means seated on the other end of the collar and forming a retainer for the packing, a plug forming a closure for therecess, to prevent the leakage of water therefrom exterior of the back head and a spring acting against the plug and the said means for compressing the packing.

3. In a rock drill, the combination of a cylinder and a back head therefor having a recess, a water tube extending through the cylinder and into the recess, a collar on the tube, a packing member in the recess to prevent leakage of water from the recess into the cylinder, a plate on the packing member forming a seat for one end of the collar, means seated on the other end of the collar and enclosing said packing, and a spring acting against said means for compressing the packing.

4. In a rock drill, the combination of a cylinder and a back head therefor having a recess, a water tube extending through the cylinder and into the recess, a collar on the tube, a packing member in the recess to prevent leakage of water from the recess into the cylinder, a plate on the packing member forming a seat for one end of the collar, a. bushing seated on the other end of the collar, a hollow extension on said bushing forming a retainer for the packing member and the plate, a plug forming a closure for the recess and having a cavity, and a spring in the cavity acting against the bushing for compressing the packing.

5. In a rock drill, the combination of a cylinder and a back head therefor having a recess, a water tube extending through the cylinder and into the recess, a collar on the tube, a packing member encircling the tube to prevent leakage of water from the recess into the cylinder, a. bushing seated on the rearward end of the collar, a hollow extension on I the bushing forming a container for the packing member, a plug forming a closure for the recess and having a cavity to slidably receive the bushing, and a spring in the cavity acting against the bushing to compress the packing.

6. In a rock drill, the combination of a cylinder and a back head therefor having a recess, a fluid connection extending through the cylinder and into the recess, positioning means on said connection, a packing member encircling the connection on one side of the positioning means, and means on the other side of said positioning means enclosing said packing member and adapted to be pressed against the positioning means to compress the packing member.

7. In a rock drill, the combination of a cylinder and a back head therefor having a recess, a fluid connection extending through the cylinder and into the recess, positioning means on said connection a packing member encircling the connection on one side of the positioning means, means on the other side of said positioning means enclosing said packing member and adapted to be pressed against the positioning means to compress the packing member, and a resilient member acting against said means to press it against the positioning means.

In testimony whereof I have signed this specification.

GEORGE W, HULSHIZER. 

